Global mean temperature has increased by 1.09 degree since pre-industrial and cause considerate inpacts. However, as a result of paucity of long-term observations, I guess that there are only some regions in Europe and North America have the climate record of mean temperature during 1850-1900 (pre-industrial period). Therefore, the so called "global warming" is not global especially in polar regions where an amplification effect found. So what is the spatial scale of global warming in IPCC AR6? Can anyone shares some researches or suggestions?

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